SID Player

C64

6510 control port

@ $0000 - Data direction register
@ $0001 - Data register
Bit 0 - LORAM - RAM / ROM @ $A000 - $BFFF (BASIC)
Bit 1 - HIRAM - RAM / ROM @ $E000 - $FFFF (KERNAL)
Bit 2 - CHAREN - I/O / ROM @ $D000 - $DFFF

Expansion port

1. GND - System ground
2. +5V DC (Maximum 450 mA)
3. +5V DC
4. IRQ
5. R/W
6. Dot clock - 8.18 MHz system clock
7. I/O1 - I/O block 1 @ $DE00-$DEFF
8. GAME
9. EPROM
10. I/O2 - I/O block 1 @ $DF00-$DFFF
11. ROML - 8 KB decoded RAM/ROM block at @ $8000
12. BA - Bus available (Goes low 3 cycles before VIC-II takes control over the bus)
13. DMA - Should only be pulled low when Ø2 is low
14. D7
15. D6
16. D5
17. D4
18. D3
19. D2
20. D1
21. D0
22. GND
23. GND
24. ROMH - 8 KB decoded RAM/ROM block at @ $E000
25. RESET
26. NMI
27. Ø2 Phase 2 system clock
28. A15
29. A14
30. A13
31. A12
32. A11
33. A10
34. A9
35. A8
36. A7
37. A6
38. A5
39. A4
40. A3
41. A2
42. A1
43. A0
44. GND

MOS6581 / MOS8580 - SID

Pin-out

Block diagram

Register map

@ $D400

1. FREQ LO - Write only (Voice 1)
2. FREQ HI
3. PW LO
4. PW HI
5. CONTROL REG
6. ATTACK/DECAY
7. SUSTAIN/RELEASE
8. FREQ LO - Write only (Voice 2)
9. FREQ HI
10. PW LO
11. PW HI
12. CONTROL REG
13. ATTACK/DECAY
14. SUSTAIN/RELEASE
15. FREQ LO - Write only (Voice 3)
16. FREQ HI
17. PW LO
18. PW HI
19. CONTROL REG
20. ATTACK/DECAY
21. SUSTAIN/RELEASE
22. FC LO - Write only (Filter)
23. FC HI
24. RES/FILT
25. MODE/VOL
26. POT X - Read only (Misc)
27. POT Y
28. OSC₃/RANDOM
29. ENV₃